Alleged Navy Yard Shooter Had Delusional Episode

A Rhode Island police report documented a paranoid episode Aaron Alexis reported in late August.
2:12 | 09/18/13

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Transcript for Alleged Navy Yard Shooter Had Delusional Episode
Lots of new details emerging overnight sparking so many questions about the shooter, aaron alexis. And it appears that serious signs of mental illness did not set off alarm bells. Reporter: You're right. Hundreds of fbi agents are fanning out across the country, desperately seeking a motive. And they're finding a string of flashing, neon warning signs that were missed. This morning, investigators are painting a picture of a man descending into madness in the days before the shooting. Abc news has learned aaron alexis came to washington in late august. Only days after an episode that can only be described as paranoid and delusional. AUGUST 7th, 6:00 A.M. Alexis allegedly called police in newport, rhode island, and began a bizarre tale, documented in a police report. He claimed an unidentified person had sent three people to follow him. And to keep him awake by talking to him and sending vibrations through his body through a microwave machine. He switched hotels three times that night. The voices, he told police, were talking to him through the walls, floor and ceiling. It's not uncommon, once you go below the surface, to find troubling issues, with just about every one of these mass shooters. Reporter: Newport authorities contacted navy station police. But it's unclear if the military took any action. The incident raises serious questions about how alexis was able to keep security clearance. How can a man with that kind of background get the necessary security clearance for a military contractor. Reporter: Alexis was in the navy from 2007 to 2011. He was hardly a model sailor. Cited for at least eight infractions. Ranging from insubordination to unexcused absences. Harassing a construction worker by shooting out his tires. But there were no prosecutions. And the red flags waved without notice. The suspect allegedly sought help from v.A. Hospitals in d.C. And rhode island, for insomnia. It's unclear if he told officials how troubled he truly was.

This transcript has been automatically generated and may not be 100% accurate.

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